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Change the timestamps recorded in transaction commit/abort xlog records

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from time_t to TimestampTz representation.  This provides full gettimeofday()
resolution of the timestamps, which might be useful when attempting to
do point-in-time recovery --- previously it was not possible to specify
the stop point with sub-second resolution.  But mostly this is to get
rid of TimestampTz-to-time_t conversion overhead during commit.  Per my
proposal of a day or two back.
This commit is contained in:
Tom Lane
2007-04-30 21:01:53 +00:00
parent 641912b4d1
commit c432061963
7 changed files with 67 additions and 42 deletions
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29
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.175 2007/04/30 03:23:49 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.176 2007/04/30 21:01:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1301,6 +1301,33 @@ timestamptz_to_time_t(TimestampTz t)
return result;
}
/*
* Produce a C-string representation of a TimestampTz.
*
* This is mostly for use in emitting messages. The primary difference
* from timestamptz_out is that we force the output format to ISO. Note
* also that the result is in a static buffer, not pstrdup'd.
*/
const char *
timestamptz_to_str(TimestampTz t)
{
static char buf[MAXDATELEN + 1];
int tz;
struct pg_tm tt,
*tm = &tt;
fsec_t fsec;
char *tzn;
if (TIMESTAMP_NOT_FINITE(t))
EncodeSpecialTimestamp(t, buf);
else if (timestamp2tm(t, &tz, tm, &fsec, &tzn, NULL) == 0)
EncodeDateTime(tm, fsec, &tz, &tzn, USE_ISO_DATES, buf);
else
strlcpy(buf, "(timestamp out of range)", sizeof(buf));
return buf;
}
void
dt2time(Timestamp jd, int *hour, int *min, int *sec, fsec_t *fsec)